I admit I no longer face those problems, but I did have those issues when I was your age. And the worst is that there's nothing we can do about it. General kids these days grow stupider than those of previous generations, and I really have a bad feeling about it.
An example, you ask? There's this one in which a girl was doing something with her mobile phone and the teacher (which was most probably more than 50 years old) confiscated it. The girl went mad and violently striked against her to get the mobile back. The famous words "Dá-me o telemóvel já!" ("Give me the mobile phone now!") will be kept in many portuguese youngsters' mind, as a video with the whole event was uploaded to YouTube. Some guy also did a remix.
And the girl? She was banned from that school.
Oh, the happenings...